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Sixty-eight patients were recruited within 4 hours and an additional 12 patients within 24 hours.Seventy-five strokes were due to infarction and five to hemorrhage.The median time to first scan was 132 minutes.Although some of the infarctions in 75 patients were detected within 1 hour,the fraction of positive first scans approached an asymptote at 2 to 3 hours. Overall,with the use of conventional non-contrast-enhanced CT and T1-and T2-weighted MRI,neither was superior in the very early detection of either hematoma or infarction.There was a marginally significant correlation between early positive brain imaging and the severity of the stroke.Some patients had initially positive CT and/or MRI scans,but their neurological examination had returned to normal by 24 hours.Overall,CT was better than baseline MRI at predicting 24-hour outcome.After 24 hours,both CT and MR more conspicuously defined the lesion limits than they did at baseline. With the technology available through 1991,neither CT nor MRI proved superior in the detection of the earliest signs of stroke. |
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CAT scan
CAT scan,abnormal
CAT scan,cerebrovascular disease
CAT scan,early changes in CVA
cerebral infarction
cerebrovascular accident
MRI
MRI,abnormal
MRI,CAT scan compared to
MRI,cerebrovascular disease
MRI,early changes in CVA
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